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(CNN)One of the most prolific serial killers in California history, a 63-year-old man dubbed the "Grim Sleeper," is headed to death row.

Los Angeles County Superior Court Judge Kathleen Kennedy upheld a jury's recommendation of the death penalty for Lonnie David Franklin Jr., a former garbage truck driver and Los Angeles Police Department garage attendant.

Franklin was convicted in May on 10 counts of first-degree murder and one count of attempted murder. Kennedy imposed the death penalty on all counts of first degree murder.

Franklin terrorized south Los Angeles in a string of murders over a 22-year period, from 1985 to 2007. He was dubbed the "Grim Sleeper" because of a gap between killings attributed to him. His victims were all women, and one was a 15-year-old girl. Prosecutors also have linked him to additional slayings.

Judge Kennedy denied the defense's motion for a new trial, and rejected their motion to reduce the punishment to life in prison without parole.

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"At the end of the day the issue for the court is whether the evidence supports the jury's verdict in this case -- which was their conclusion that the aggravating circumstances so outweigh the mitigating circumstances that death is appropriate," Kennedy told the courtroom.

"I find that the aggravating circumstances do so substantially outweigh the circumstances of mitigation as to warrant death -- and that the jury's verdict imposing the death penalty is fully supported by the law and the evidence presented at this trial."

Franklin, who has close cropped hair and wears glasses, stared straight ahead and remained silent as more than a dozen relatives and friends of the victims spoke Wednesday inside a hushed courtroom. Some broke down as they described their loved ones, others commented on his stoic appearance in court.

"You sit there with a blank face, since the whole trial, no remorse, no nothing, but today is our day," said the sister of one victims, holding back tears.

"She still talks to me in my dreams," said another woman, who said she lost "her best friend, her sister, her everything".

"You are truly a piece of evil," said a third woman.

"No one expects to bury their child, but that's what my husband and I had to do," said the mother of a 23-year-old victim.

DNA evidence to the rescue

Franklin was arrested in July 2010 through DNA technology that did not exist in the 1980s when the initial killings happened.

Prosecutors built their case on that DNA evidence, including Franklin's saliva on many of his victims' bodies, along with ballistic evidence and the testimony of a surviving victim.

During the three-month trial featuring the testimony of more than 60 witnesses, prosecutors portrayed Franklin as a sexual predator who killed his victims, then dumped their bodies in alleys and dumpsters in South Los Angeles, all within a few miles of his home. Most wore disheveled clothing suggesting they had been re-dressed and moved, Deputy District Attorney Beth Silverman said in her closing argument. They carried no identification.

"He did it over, and over, and over, and over and over, and over," Silverman told jurors. "All of the murders in this case are first degree. They are all willful. They are all deliberate. They are all premeditated."

In June, the same Los Angeles jury that convicted Franklin recommended the death sentence.

During this penalty phase, prosecutors introduced evidence tying Franklin to four additional deaths of women between 1984 and 2006.

The jury also heard from a woman from Germany whom Franklin kidnapped and raped in 1974 while he was in the U.S. Army.

A surviving victim

The one victim who survived testified that Franklin coaxed her into his orange Pinto in 1988 and, without warning, pulled out a handgun and shot her in the chest. Enietra Washington said she remembered Franklin climbing on top of her and a camera flashing as she lost consciousness.

He pushed her out of the moving car, assuming she was dead, Silverman said.

When detectives searched Franklin's house two decades later they found pictures of Washington hidden behind a wall, Silverman told the jury.

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Debra Jackson – On August 10, 1985, cocktail waitress Debra Jackson, 29, left her friend's Lynwood house and went to take a bus to her apartment in South-Central Los Angeles. Her body, with three gunshot wounds to the chest, was found days later in an alley.

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Henrietta Wright – Henrietta Wright, 35, was found dead August 12, 1986, in a South Los Angeles alley. Wright, who was shot twice in the chest, was found barefoot, wrapped in a blanket and covered with a mattress. Police said her mouth had been gagged with a cloth.

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Barbara Ware – Barbara Ware, 23, was found dead January 10, 1987. Ware's body was found under a pile of trash in an alley. She had been shot once in the chest.

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Bernita Sparks – On April 15, 1987, 26-year-old Bernita Sparks told her mother she needed to go to the store for cigarettes but never returned. She was found the next day in a trash bin, covered in garbage. She had been beaten, strangled and shot in the chest.

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Mary Lowe – Late on Halloween night in 1987, 26-year-old Mary Lowe told her mother she was going to a party. It was the last time she was seen. Her body was found the next day in an alley. She had been shot once in the chest.

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Lachrica Jefferson – The body of 22-year-old Lachrica Jefferson was found January 30, 1988. Like the other victims, she had been shot in the chest and left in an alley.

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Alicia Alexander – On September 11, 1988, Alicia "Monique" Alexander asked her father whether he needed anything from the liquor store before leaving the house. The body of the 18-year-old was found days later in an alley. Police said she had been sexually assaulted and shot in the chest.

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Princess Berthomieux – Princess Berthomieux disappeared December 21, 2001. No clues into the 15-year-old's whereabouts came until March 19, 2002, when her body was found in an alley. She was strangled and beaten. DNA on her body matched DNA left on the bodies of the other victims, signaling to police that the killer's 13-year hiatus was over.

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Valerie McCorvey – The body of 35-year-old Valerie McCorvey was found in an alley on July 11, 2003. Police said she had been sexually assaulted and strangled. They initially suspected her boyfriend until DNA on her body was found to match DNA of earlier victims.

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Janecia Peters – A homeless man found the body of Janecia Peters, 25, on January 1, 2007. She had been shot in the back and placed in a garbage bag.

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Enietra Washington – Enietra Washington is the only known survivor of the Grim Sleeper. She was raped and shot in November 1988 before she managed to escape. Washington is expected to be the star witness in the trial of the accused killer, Lonnie David Franklin Jr. Franklin is charged with attempted murder in Washington's attack.

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The prosecutor also reminded jurors of a videotaped police interrogation of Franklin, played during the trial, in which she said the accused killer did not appear surprised about the allegations against him. He laughed at times and called one victim "fat" and another "butt ugly" as detectives showed him photos.

Evidence in the case spanned three decades of policing in Southern California, from the murderous, crack-fueled 1980s, during which at least two serial killers were operating in South Los Angeles, to the creation of an LAPD cold-case unit and the modern era of advanced DNA testing.

Prosecutors say Franklin's first killing spree began in the summer of 1985 and seemingly ended three years later. Police did not know the killer's identity at the time but had linked seven slayings to the same .25-caliber handgun. The then-unknown killer apparently fell dormant for years. Decades later, in 2010, detectives matched the killer's DNA to a recently convicted felon who was the son of Franklin.

Serial killer 'hiding in plain sight'

Detectives placed Franklin under 24-hour surveillance and came up with a plan to obtain a sample of his DNA.

An undercover officer posed as a waiter at a local restaurant and collected a pizza crust left behind by the suspect. DNA taken from the crust matched DNA left by the suspect in multiple murders, according to Detetive Dennis Kilcoyne.

When police raided his South Los Angeles home, they discovered photos and videos of dozens of unidentified women. Police have since accounted for the identities and whereabouts of some of the women, but others remain unknown.

Silverman called Franklin a "serial killer who was hiding in plain sight."

"Science in 2010 finally caught up with the defendant for the crimes he committed since the 1980s," she said shortly before the case went to the jury.

Franklin will head to the San Quentin State prison, north of San Francisco.

Judge Kennedy said she has been a jurist for 28 years and could not think of anyone who had committed such monstrous crimes.

"If I could snap my fingers and bring all these victims back to life, I would do it in a heartbeat ..." she said. "But at the end of the day, your loved one, your daughter, your sister, your mother, your friend, is still gone. Hopefully there is some measure of justice you will feel, but closure is not what this trial is about."